How To Consume UME services in Web Dynpro applications

Dear Friends,
I am developing a new web dynpro application in which i want to get the user related information in my dynpro code. I have used com.sap.secuirty.jar file in class path -> lib of my project.
I have written code sth like this.
IUser user = null;
String username = user.getCurrentUser().getSAPUser();
and defined sap.authentication as a application variable to fetch user creadentials from portal run time.(user logs in to the portal and dynpro application fetches user credentials from portal). When i do this, the login window appears twice and user needs to enter his credentials more than once. If I remove sap.authentication parameter from the application then i am not able to get the user credentials. Could you please tell me the right method of fetching the user credentials in web dynpro application? Do we need to use sap.authentication? do we need to include sharing reference of the usermanagement in our application?
kindly share your knowledge.

These might be good places for you to start.
[User|http://help.sap.com/saphelp_nw04s/helpdata/en/80/45da9619d24b61bb869c31ef3b780a/frameset.htm]
[Protecting Access to the Web Dynpro Application Using UME Permissions|http://help.sap.com/saphelp_nw04s/helpdata/en/f3/a64d401be96913e10000000a1550b0/frameset.htm]
-Michael
Edited by: Michael Shea on Sep 2, 2008 8:24 AM
Edited by: Michael Shea on Sep 2, 2008 8:25 AM
Fix link

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Message was edited by:
Roy Cohen

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